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I entirely disagree with you my dear friend Mickey D. We know that brightness is entirely physical and independent of any human being, and not dependent of our eyes, much less of our brain, on the contrary, our pupils react to brightness, and in dark environment, our pupil naturally expands to allow more light in)

I have a disease called photophobia, basically is high sensibility to light. In daytime I have to use sunglasses because everything is too bright for my eyes. In front of computers with bright screens I tend to close or squeeze my eyes in order to see clearly. I have been told that the problem is in my retina.
This is a proof that brightness is outside, because if not I would never have any problem with brightness outside of me.

and about colors..
we have proofs of colors outside, look chameleons, tropical birds and thousands of other species that use color in their very life reliant uses...
btw, white light is actually all colors mixed and there is no other way that light could exist without colors, light was here long before us. (so yes, colors are real either)

Here's a good video on the subject: https://www.youtube.com/watch?v=o0DYP-u1rNM